【題目】This kind of robot _____help people do dangerous work.

A. used toB. was used toC. used forD. was used for

【答案】B

【解析】

句意:這種機器人被用來幫助人們做危險的工作。A. used to過去常常;B. was used to被用來做某事;C. used for用于;D. was used for被用于……。for是介詞,因此后面跟動名詞,help是動詞原形,所以排除C/D;主語This kind of robotuse之間存在著被動關系,因此應該用被動句。故選B。

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